PHASE CONVERSION

221

ply voltage, E0, and current, 70, in one coil, and producing a voltage
of displaced phase, JSF2, and current of displaced phase, I2, in
another coil displaced in position.

Thus if a quarter-phase motor shown diagrammatically in Fig.
69A is operated by a single-phase voltage, EQ, supplied to the one

Eo
Io

Yo

FIG. 69.—Induction phase converter diagram.
phase, in the other phase a quadrature voltage, Ez, is produced
and quadrature current can be derived from this phase.
The induction machine, Fig. 69A, is essentially a transformer,
giving two transformations in series: from the primary supply
circuit, EQ!Q, to the secondary circuit or rotor, EJi, and from the
rotor circuit,' .Eu/i, as primary circuit, to the other stator circuit